EP2060290A1 - Plunger rod and syringe - Google Patents
Plunger rod and syringe Download PDFInfo
- Publication number
- EP2060290A1 EP2060290A1 EP08019559A EP08019559A EP2060290A1 EP 2060290 A1 EP2060290 A1 EP 2060290A1 EP 08019559 A EP08019559 A EP 08019559A EP 08019559 A EP08019559 A EP 08019559A EP 2060290 A1 EP2060290 A1 EP 2060290A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger rod
- syringe barrel
- piston
- cylindrical member
- syringe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
- A61M5/31515—Connection of piston with piston rod
Definitions
- This invention relates to a plunger rod useful for supporting and sliding a piston inserted in a syringe barrel, and also to a syringe.
- prefilled syringes with medicaments already filled in syringe barrels have been developed to reduce the work load in medical care practice. Further, prefilled syringes with medicaments such as contrast media filled in syringe barrels thereof are finding increasing utility recently.
- prefilled plastic syringe barrels with medicaments such as contrast media filled in plastic syringe barrels of relative large capacities are also in use in recent years.
- a piston is attached to a forward end of a plunger rod by inserting the plunger rod into the syringe barrel through a rear end thereof and bringing a threaded portion, which is formed on a forward end of the plunger rod, into threaded engagement with a rear face of the piston.
- a threaded portion which is formed on a forward end of the plunger rod
- the plunger rod may be pushed in a misaligned attitude if there is clearance between an outer wall of the plunger rod and an inner wall of the syringe barrel.
- the piston maybe caused to slide with its axis offset fromparallel to the central axis of the syringe barrel, leading to a potential problem that fluid leakage may take place at the clearance.
- the setting of the plates at a width substantially equal to the inner diameter of the syringe barrel makes it possible to prevent the plunger rod from becoming out of alignment when force is applied in the plane direction of any one of the plates, because the corresponding plate is in contact with the inner wall of the syringe barrel.
- the plates Against force in a direction other than the plane directions of the plates, however, the plates cannot function, leading to a potential problem that the piston may be misaligned to cause fluid leakage or the like.
- An object of the present invention is, therefore, to provide a plunger rod for a syringe, saidplunger rodpermitting easy attachment of a piston to a threaded portion at a forward end of the plunger rod with a central axis of a syringe barrel and that of the plunger rod being readily maintained in alignment with each other; and also making it possible to prevent the piston from being caused to slide in an attitude that the central axis of the piston is offset from parallel to the central axis of the syringe barrel.
- Another object of the present invention is to provide a syringe provided with such a plunger rod.
- a plunger rod useful for supporting and sliding a piston inserted in a syringe barrel, said plunger rod having a threaded portion formed at an end of the plunger rod to attach the piston on the plunger rod and a flange formed at an opposite end of the plunger rod, wherein the threaded portion and the flange are integrally connected together by a cylindrical member having an outer diameter such that the cylindrical member can be inserted with contact slidability in the syringe barrel.
- the plunger rod may further comprise a thumb support member arranged in a hollow opening formed in the flange on the cylindrical member; and the thumb support member may preferably comprise plural ribs arranged along a direction of a length of the cylindrical member at least inside the cylindrical member.
- the plural ribs may be formed in a cross-sectionally cruciform shape, or may be partially cut off along a central axis of the cylindrical member.
- the thumb support member may also comprise a plug fitted in the hollow opening formed in the flange on the cylindrical member.
- the threaded portion may be a short cylinder, and plural ribs may be formed inside the short cylinder.
- the plunger rod may be integrally formed in an entirety thereof with at least one resin selected from the group consisting of cyclic olefin resins, radiation-resistant polypropylene resin and polypropylene resin.
- a syringe comprising a syringe barrel set having a syringe barrel, which is provided at an end thereof with a medicament delivery tip sealed with a closure and is open at an opposite end thereof, and a piston having a screw bore formed along a central axis of the piston in a rear portion of the piston and slidably sealing the open end of the syringe barrel; and the above-described plunger rod according to the present invention.
- a plunger rod for a syringe permits easy attachment of a piston to a threaded portion at a forward end of the plunger rod with a central axis of a syringe barrel and that of the plunger rod being readily maintained in alignment with each other, and further, can prevent the piston from being caused to slide in an attitude that the central axis of the piston is offset from parallel to the central axis of the syringe barrel.
- the plunger rod does not cause fluid leakage.
- the present invention can provide a syringe, which is provided with such a plunger rod and has similar advantages as the above-described plunger rod.
- FIG. 1 is a side view of a plunger rod according to a first embodiment of the present invention.
- FIG. 2A is an enlarged front view in the direction of arrow X in FIG. 1
- FIG. 2B is an enlarged rear view in the direction of arrow Y in FIG. 1 .
- FIG. 3 is a partly cross-sectional view of a syringe according to the present invention, which is equipped with the plunger rod of FIG. 1 .
- FIGS. 4A and 4B are similar to FIGS. 2A and 2B , but show a plunger rod according to a second embodiment of the present invention.
- FIGS. 5A and 5B are a downward and upward, perspective views of the plunger rod according to the second embodiment of the present invention.
- FIG. 6 is a partly cut-off, partly cross-sectional, perspective view of the plunger rod according to the second embodiment of the present invention.
- FIGS. 7A and 7B are similar to FIGS. 2A and 2B , but show a plunger rod according to a third embodiment of the present invention.
- FIGS. 8A and 8B are a downward and upward, perspective views of the plunger rod according to the third embodiment of the present invention.
- FIG. 9 is a partly cut-off, partly cross-sectional, perspective view of the plunger rod according to the third embodiment of the present invention.
- FIG. 10 is a side view of a plunger rod according to a fourth embodiment of the present invention.
- a plunger rod 50 according to the first embodiment of the present invention is useful for supporting and sliding a piston 12 inserted in a syringe barrel 11.
- a threaded portion 1 is formed to permit attachment of the piston 12, and on an opposite end of the plunger rod 50, a flange 2 is formed.
- the threaded portion 1 and the flange portion 2 are integrally connected together by a cylindrical member 3 having an outer diameter such that the cylindrical member 3 can be inserted with contact slidabilityinthesyringebarrel, specifically an outer diameter either equal to or slightly smaller than an inner diameter of the syringe barrel 11.
- the plunger rod 50 can be integrally molded by injection molding with at least one resin selected from the group consisting of cyclic olefin resins, radiation-resistant polypropylenes, polypropylene, polycarbonates and polystyrene.
- the cylindrical member 3 can have the following dimensions - inner diameter (A1) : approx. 1 to 48 mm, outer diameter (B1) : approx. 3 to 50 mm (wall thickness: approx. 1 to 3 mm) , and length (L1) : approx. 30 to 200 mm.
- the main body of the threaded portion 1 arranged on one of the ends of the cylindrical member 3 is cylindrical, and can have the following dimensions - outer diameter (A2) : approx.
- Threads 4 are arranged on the surface of the main body of the threaded portion 1.
- the flange 2 formed on the opposite end of the cylindrical member 3 has the following dimensions - outer diameter (C) : approx. 10 to 50 mm, and thickness (W): approx. 1 to 5 mm.
- FIG. 3 The state of the plunger rod 50 according to the first embodiment of the present invention in its use is illustrated in FIG. 3 .
- the plunger rod 50 is inserted through the rear end of the syringe barrel 11.
- the plunger rod 50 is accurately guided into the syringe barrel 11 because no clearance is formed between the outer wall of the cylindrical member 3 and the inner wall of the syringe barrel 11.
- the syringe barrel 11 and the cylindrical member 3 are coaxial cylinders, respectively, the central axis of the syringe barrel 11 and the central axis of the plunger rod 50 are naturally brought into alignment.
- the plunger rod 50 therefore, makes it possible to readily bring the central axis of the syringe barrel 11 and the central axis of the plunger rod 50 into alignment with each other without needing precise positioning or the like, so that the piston 12 can be attached to the end of the plunger rod 50 in a correct attitude (an attitude that the central axis of the piston 12 is in alignment with the central axis of the plunger rod 50. Owing to the existence of no clearance between the outer wall of the plunge rod 50 and the inner wall of the syringe barrel 11, the plunger rod 50 is not pushed in any misaligned attitude. The piston 12 is, therefore, allowed to smoothly slide in the syringe barrel 11, so that the sealing performance for the medicament 15 is not deteriorated and no fluid leakage takes place between the inner wall of the syringe barrel 11 and the outer wall of the piston 12.
- a plunger rod 60 according to the second embodiment of the present invention will next be described.
- plural ribs 5A are formed as a thumb support member along the direction of the length of the cylindrical member 3. Described specifically, when the plunge rod 50 according to the first embodiment of the present invention is relatively large, for example, when the inner diameter (A1) of the cylindrical member 3 is 8 mm or greater, a part of the ball of the thumb may go into a rear end portion of the cylindrical member 3 upon use, and the comfort of its use may not be good in some instances.
- the formation of a thumb support member by the plural ribs 5A can eliminate the above-described problem in the comfort of use.
- two ribs 5A are formed, one in a vertical direction and the other in a horizontal direction, namely, in a cruciform shape.
- One or more ribs can, however, be employed insofar as the above-described advantageous effect (the provision of a support for the thumb) can be brought about.
- the ribs 5A are formed over the entire length of the cylindrical member 3 for the convenience of the integral molding of the plunger rod 60.
- the main body of the threaded portion 1 is arranged in the form of a short cylinder for the convenience of its injection molding, and similar to the ribs 5A, ribs 6 are also arranged in the short cylinder.
- the formation of the ribs 6 is not essential, but by the formation of the ribs 6, the piston 12 can be protected from deformations during the sliding movement of the piston 12. It is, therefore, preferred to arrange the rib 6.
- the ribs 6 are not limited to the illustrated cruciform arrangement, and can be arranged in any form and dimensions insofar as they are shaped and dimensioned to come into contact with an end of a screw bore 16 formed in a rear portion of the piston 12. However, a cruciform arrangement is particularly preferred from the standpoints of the readiness and economy of molding.
- FIGS. 7A, 7B , 8A, 8B and 9 depict a plunger rod 70 according to the third embodiment of the present invention.
- the plural ribs 5A (as the thumb support member) are partly cut off to form cut-off portions 7. Described specifically, ribs are now assumed to be arranged integrally with a cylindrical member as in the second embodiment. When such a molding is removed from the mold and cooled subsequent to its injection molding, the resin undergoes cooling shrinkage so that the cross-sectional roundness of the cylindrical member is reduced to some extent. The reduction in the cross-sectional roundness due to the above-described cooling shrinkage is not much, and is still within a practically acceptable range.
- the plural ribs 5A,5B are used as thumb support members, respectively.
- the thumb support member is not limited to the ribs 5A or 5B and that any means can be adopted insofar as the thumb can be prevented from going into a rear end portion of a plunger rod.
- the thumb support member can be, for example, a plug 8 closing a hollow opening formed in a flange 2 of a plunger rod 80 according to the fourth embodiment of the present invention.
- This plug 8 is not limited to the illustrated example, and can take any other form, for example, can be a cap insofar as it can support the thumb. Concerning the material of the plug 8, it may be formed of the same material as the plunger rod or may be formed of a rubber similar to that employed for rubber plugs.
- the present invention also provides a syringe composed of a syringe barrel set and the above-described plunger rod according to the present invention.
- the syringe may be a prefilled syringe with a medicament filled therein.
- the plunger rod 50 according to the first embodiment as one example of the plunger rod according to the present invention, a description will hereinafter be made about a prefilled syringe according to the present invention.
- the prefilled syringe is composed of a medicament-prefilled syringe barrel set 100 and the plunger rod 50 according to the present invention.
- the medicament-prefilled syringe barrel set 100 includes the syringe barrel 11, the piston 12 slidably inserted in the syringe barrel 11, and a medicament 15 dispensably sealed by the piston 12 within the syringe barrel 11.
- the syringe barrel 11 is equipped at an end thereof with a medicament delivery tip 14 sealed by a suitable closure 13, and is open at an opposite end thereof.
- the medicament-prefilled syringe barrel set 100 may have a similar construction as conventional medicament-prefilled syringe barrel sets, except that the piston 12 is provided at the rear end portion thereof with the screw bore 16 with which the threaded portion 1 of the plunger rod 50 according to the present invention canbe brought into threaded engagement and that the syringe barrel 11 has an inner diameter such that the cylindrical member 3 of the plunger rod 50 can be inserted with contact slidability in the syringe barrel 11, for example, an inner diameter either equal to or somewhat greater than the outer diameter of the cylindrical member 3 of the plunger rod 50.
- the syringe barrel 11 can be made of glass or a resin such as a cyclic polyolefin.
- the medicament delivery tip 14 arranged at one end of the syringe barrel 11 is sealed with the suitable closure 13, for example, a rubber cap of excellent chemical resistance or a rubber cap covered with a plastic film having excellent chemical resistance.
- the medicament 15 prefilled within the syringe barrel 11 can be, for example a desired medicament such as a contrast medium, and is sealed by the piston 12 which can be made, for example, of rubber of excellent chemical resistance or rubber covered with a plastic film having excellent chemical resistance.
- a forward endportion of the plunger rod 50 according to the present invention is inserted through the read end of the syringe barrel 11.
- the plunger rod 50 is guided by the inner wall of the syringe barrel 11 because no clearance is formed between the outer wall of the cylindrical member 3 of the plunger rod 50 and the inner wall of the syringe barrel 11.
- the central axis of the plunger rod 50 is naturally brought into alignment with the central axis of the syringe barrel 11.
- the plunger rod 50 With the central axis of the plunger rod 50 maintained in alignment with the central axis of the syringe barrel 11 as described above, the plunger rod 50 is pushed straight into the syringe barrel 11, and further, the plunger rod 50 is turned to bring the threaded portion 1, which is arranged at the forward end of the plunger rod 50, into threaded engagement with the screw bore 16 formed along the central axis of the piston in the rear end portion of the piston 12. To the free end of the plunger rod 50, the piston 12 can be attached in a correct attitude (i.e., in the attitude that the central axis of the piston 12 is in alignment with the central axis of the plunger rod 50).
- the rubber closure 13 by which the medicament delivery tip 14 of the syringe barrel 11 is sealed is then removed, and to the medicament delivery tip 14, a syringe needle or a free end of an extension tube is fitted, for example.
- the medicament 15 can be injected or otherwise delivered to an intended site, for example, into the body via the syringe needle, the extension tube or the like.
- the piston can be prevented from sliding in an attitude misaligned with the central axis with the syringe barrel 11. It is, therefore, possible to prevent the occurrence of fluid leakage.
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- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
Description
- This application claims the priority of Japanese Patent Application
2007-299089 filed November 19, 2007 - This invention relates to a plunger rod useful for supporting and sliding a piston inserted in a syringe barrel, and also to a syringe.
- With syringes, it has been common practice to draw medicaments into syringe barrels upon use. In recent years, however, prefilled syringes with medicaments already filled in syringe barrels have been developed to reduce the work load in medical care practice. Further, prefilled syringes with medicaments such as contrast media filled in syringe barrels thereof are finding increasing utility recently. In addition, prefilled plastic syringe barrels with medicaments such as contrast media filled in plastic syringe barrels of relative large capacities are also in use in recent years.
- When using such a syringe barrel, a piston is attached to a forward end of a plunger rod by inserting the plunger rod into the syringe barrel through a rear end thereof and bringing a threaded portion, which is formed on a forward end of the plunger rod, into threaded engagement with a rear face of the piston. By sliding the piston, which is attached to the forward end of the plunger rod as described above, via the plunger rod, drawing or dispensing of a medicament is performed.
- When attaching the piston to the forward end of the plunger rod as described above, the threaded portion at the forward end of the plunger rod cannot be smoothly brought into threaded engagement with the rear face of the piston unless a central axis of the syringe barrel and that of the plunger rod are brought into alignment. If the piston is attached to the threaded portion on the forward end of the plunger rod with the central axis of the syringe barrel and that of the plunger rod being out of alignment, the piston on the forward end of the plunger rod comes into a misaligned attitude so that the piston is no longer allowed to smoothly slide in the syringe barrel.
- Even when the piston and the plunger rod are properly attached together, the plunger rod may be pushed in a misaligned attitude if there is clearance between an outer wall of the plunger rod and an inner wall of the syringe barrel. As a consequence, the pistonmaybe caused to slide with its axis offset fromparallel to the central axis of the syringe barrel, leading to a potential problem that fluid leakage may take place at the clearance.
- As a method for solving the above-described problem, it has been proposed to use a cross-sectionally cruciform plunger rod formed by turning one of two rectangular plates, which have long axes in a direction of a central axis of a syringe barrel, over 90 degrees relative to the other while maintaining their long axes aligned together (
JP-A-06-327771 - As a method for overcoming the above-mentioned potential problem, it has been proposed to use a plunger rod with a disk-shaped partition, which has a diameter equal to the widths of the plates, arranged at right angles relative to the central axis of the plunger rod around the above-described cross-sectionally cruciform plunger rod (
WO2001/005456 ). Even with this overcoming method, it is still impossible to prevent misalignment of the plunger rod at portions where the partition is not arranged, so that fluid leakage cannot be prevented completely. - An object of the present invention is, therefore, to provide a plunger rod for a syringe, saidplunger rodpermitting easy attachment of a piston to a threaded portion at a forward end of the plunger rod with a central axis of a syringe barrel and that of the plunger rod being readily maintained in alignment with each other; and also making it possible to prevent the piston from being caused to slide in an attitude that the central axis of the piston is offset from parallel to the central axis of the syringe barrel. Another object of the present invention is to provide a syringe provided with such a plunger rod.
- The above-described objects can be achieved by the present invention to be described hereinafter. Described specifically, in one aspect of the present invention, there is thus provided a plunger rod useful for supporting and sliding a piston inserted in a syringe barrel, said plunger rod having a threaded portion formed at an end of the plunger rod to attach the piston on the plunger rod and a flange formed at an opposite end of the plunger rod, wherein the threaded portion and the flange are integrally connected together by a cylindrical member having an outer diameter such that the cylindrical member can be inserted with contact slidability in the syringe barrel.
- In the above-described present invention, the plunger rod may further comprise a thumb support member arranged in a hollow opening formed in the flange on the cylindrical member; and the thumb support member may preferably comprise plural ribs arranged along a direction of a length of the cylindrical member at least inside the cylindrical member. For example, the plural ribs may be formed in a cross-sectionally cruciform shape, or may be partially cut off along a central axis of the cylindrical member. Preferably, the thumb support member may also comprise a plug fitted in the hollow opening formed in the flange on the cylindrical member. Preferably, the threaded portion may be a short cylinder, and plural ribs may be formed inside the short cylinder. Preferably, the plunger rod may be integrally formed in an entirety thereof with at least one resin selected from the group consisting of cyclic olefin resins, radiation-resistant polypropylene resin and polypropylene resin.
- In another aspect of the present invention, there is also provided a syringe comprising a syringe barrel set having a syringe barrel, which is provided at an end thereof with a medicament delivery tip sealed with a closure and is open at an opposite end thereof, and a piston having a screw bore formed along a central axis of the piston in a rear portion of the piston and slidably sealing the open end of the syringe barrel; and the above-described plunger rod according to the present invention.
- According to the present invention, it is possible to provide a plunger rod for a syringe. The plunger rod permits easy attachment of a piston to a threaded portion at a forward end of the plunger rod with a central axis of a syringe barrel and that of the plunger rod being readily maintained in alignment with each other, and further, can prevent the piston from being caused to slide in an attitude that the central axis of the piston is offset from parallel to the central axis of the syringe barrel. In addition, the plunger rod does not cause fluid leakage. The present invention can provide a syringe, which is provided with such a plunger rod and has similar advantages as the above-described plunger rod.
-
FIG. 1 is a side view of a plunger rod according to a first embodiment of the present invention. -
FIG. 2A is an enlarged front view in the direction of arrow X inFIG. 1 , andFIG. 2B is an enlarged rear view in the direction of arrow Y inFIG. 1 . -
FIG. 3 is a partly cross-sectional view of a syringe according to the present invention, which is equipped with the plunger rod ofFIG. 1 . -
FIGS. 4A and 4B are similar toFIGS. 2A and 2B , but show a plunger rod according to a second embodiment of the present invention. -
FIGS. 5A and 5B are a downward and upward, perspective views of the plunger rod according to the second embodiment of the present invention. -
FIG. 6 is a partly cut-off, partly cross-sectional, perspective view of the plunger rod according to the second embodiment of the present invention. -
FIGS. 7A and 7B are similar toFIGS. 2A and 2B , but show a plunger rod according to a third embodiment of the present invention. -
FIGS. 8A and 8B are a downward and upward, perspective views of the plunger rod according to the third embodiment of the present invention. -
FIG. 9 is a partly cut-off, partly cross-sectional, perspective view of the plunger rod according to the third embodiment of the present invention. -
FIG. 10 is a side view of a plunger rod according to a fourth embodiment of the present invention. - The present invention will hereinafter be described in further detail with reference to the accompanying drawings illustrating best modes for practicing the present invention. As illustrated in
FIGS. 1 ,2A ,2B and3 , aplunger rod 50 according to the first embodiment of the present invention is useful for supporting and sliding apiston 12 inserted in asyringe barrel 11. On an end of theplunger rod 50, a threadedportion 1 is formed to permit attachment of thepiston 12, and on an opposite end of theplunger rod 50, aflange 2 is formed. The threadedportion 1 and theflange portion 2 are integrally connected together by acylindrical member 3 having an outer diameter such that thecylindrical member 3 can be inserted with contact slidabilityinthesyringebarrel, specifically an outer diameter either equal to or slightly smaller than an inner diameter of thesyringe barrel 11. - The
plunger rod 50 can be integrally molded by injection molding with at least one resin selected from the group consisting of cyclic olefin resins, radiation-resistant polypropylenes, polypropylene, polycarbonates and polystyrene. Thecylindrical member 3 can have the following dimensions - inner diameter (A1) : approx. 1 to 48 mm, outer diameter (B1) : approx. 3 to 50 mm (wall thickness: approx. 1 to 3 mm) , and length (L1) : approx. 30 to 200 mm. The main body of the threadedportion 1 arranged on one of the ends of thecylindrical member 3 is cylindrical, and can have the following dimensions - outer diameter (A2) : approx. 2 to 40 mm, inner diameter (B2) : approx. 4 to 38 mm (wall thickness: approx. 0.5 to 3 mm), and length (L2) : approx. 3 to 20 mm.Threads 4 are arranged on the surface of the main body of the threadedportion 1. On the other hand, theflange 2 formed on the opposite end of thecylindrical member 3 has the following dimensions - outer diameter (C) : approx. 10 to 50 mm, and thickness (W): approx. 1 to 5 mm. - The state of the
plunger rod 50 according to the first embodiment of the present invention in its use is illustrated inFIG. 3 . When it is desired to use theplunger rod 50 according to the first embodiment of the present invention with a medicament-prefilled syringe barrel 100, theplunger rod 50 is inserted through the rear end of thesyringe barrel 11. When theplunger rod 50 is inserted through the rear end of thesyringe barrel 11, theplunger rod 50 is accurately guided into thesyringe barrel 11 because no clearance is formed between the outer wall of thecylindrical member 3 and the inner wall of thesyringe barrel 11. As thesyringe barrel 11 and thecylindrical member 3 are coaxial cylinders, respectively, the central axis of thesyringe barrel 11 and the central axis of theplunger rod 50 are naturally brought into alignment. - The
plunger rod 50 according to the first embodiment of the present invention, therefore, makes it possible to readily bring the central axis of thesyringe barrel 11 and the central axis of theplunger rod 50 into alignment with each other without needing precise positioning or the like, so that thepiston 12 can be attached to the end of theplunger rod 50 in a correct attitude (an attitude that the central axis of thepiston 12 is in alignment with the central axis of theplunger rod 50. Owing to the existence of no clearance between the outer wall of theplunge rod 50 and the inner wall of thesyringe barrel 11, theplunger rod 50 is not pushed in any misaligned attitude. Thepiston 12 is, therefore, allowed to smoothly slide in thesyringe barrel 11, so that the sealing performance for themedicament 15 is not deteriorated and no fluid leakage takes place between the inner wall of thesyringe barrel 11 and the outer wall of thepiston 12. - With reference to
FIGS. 4A, 4B ,5A, 5B and6 , aplunger rod 60 according to the second embodiment of the present invention will next be described. At least inside acylindrical member 3,plural ribs 5A are formed as a thumb support member along the direction of the length of thecylindrical member 3. Described specifically, when theplunge rod 50 according to the first embodiment of the present invention is relatively large, for example, when the inner diameter (A1) of thecylindrical member 3 is 8 mm or greater, a part of the ball of the thumb may go into a rear end portion of thecylindrical member 3 upon use, and the comfort of its use may not be good in some instances. The formation of a thumb support member by theplural ribs 5A, however, can eliminate the above-described problem in the comfort of use. In the above-described second embodiment, tworibs 5A are formed, one in a vertical direction and the other in a horizontal direction, namely, in a cruciform shape. One or more ribs can, however, be employed insofar as the above-described advantageous effect (the provision of a support for the thumb) can be brought about. It is to be noted that theribs 5A are formed over the entire length of thecylindrical member 3 for the convenience of the integral molding of theplunger rod 60. - As depicted in
FIG. 4A , the main body of the threadedportion 1 is arranged in the form of a short cylinder for the convenience of its injection molding, and similar to theribs 5A,ribs 6 are also arranged in the short cylinder. The formation of theribs 6 is not essential, but by the formation of theribs 6, thepiston 12 can be protected from deformations during the sliding movement of thepiston 12. It is, therefore, preferred to arrange therib 6. Theribs 6 are not limited to the illustrated cruciform arrangement, and can be arranged in any form and dimensions insofar as they are shaped and dimensioned to come into contact with an end of a screw bore 16 formed in a rear portion of thepiston 12. However, a cruciform arrangement is particularly preferred from the standpoints of the readiness and economy of molding. -
FIGS. 7A, 7B ,8A, 8B and9 depict aplunger rod 70 according to the third embodiment of the present invention. In this third embodiment, theplural ribs 5A (as the thumb support member) are partly cut off to form cut-offportions 7. Described specifically, ribs are now assumed to be arranged integrally with a cylindrical member as in the second embodiment. When such a molding is removed from the mold and cooled subsequent to its injection molding, the resin undergoes cooling shrinkage so that the cross-sectional roundness of the cylindrical member is reduced to some extent. The reduction in the cross-sectional roundness due to the above-described cooling shrinkage is not much, and is still within a practically acceptable range. By including the above-described cut-offportions 7, however, the above-described reduction in the cross-sectional roundness due to cooling shrinkage can be eliminated to provide improved contact slidability between the outer wall of thecylindrical member 3 and the inner wall of thesyringe barrel 11, so that fluid leakage can be avoided more completely. - In the above-described second and third embodiments, the
plural ribs ribs FIG. 10 , the thumb support member can be, for example, aplug 8 closing a hollow opening formed in aflange 2 of aplunger rod 80 according to the fourth embodiment of the present invention. Thisplug 8 is not limited to the illustrated example, and can take any other form, for example, can be a cap insofar as it can support the thumb. Concerning the material of theplug 8, it may be formed of the same material as the plunger rod or may be formed of a rubber similar to that employed for rubber plugs. - As depicted in
FIG. 3 , the present invention also provides a syringe composed of a syringe barrel set and the above-described plunger rod according to the present invention. The syringe may be a prefilled syringe with a medicament filled therein. Using theplunger rod 50 according to the first embodiment as one example of the plunger rod according to the present invention, a description will hereinafter be made about a prefilled syringe according to the present invention. As shown inFIG. 3 , the prefilled syringe is composed of a medicament-prefilled syringe barrel set 100 and theplunger rod 50 according to the present invention. The medicament-prefilled syringe barrel set 100 includes thesyringe barrel 11, thepiston 12 slidably inserted in thesyringe barrel 11, and amedicament 15 dispensably sealed by thepiston 12 within thesyringe barrel 11. Thesyringe barrel 11 is equipped at an end thereof with amedicament delivery tip 14 sealed by asuitable closure 13, and is open at an opposite end thereof. - The medicament-prefilled syringe barrel set 100 may have a similar construction as conventional medicament-prefilled syringe barrel sets, except that the
piston 12 is provided at the rear end portion thereof with the screw bore 16 with which the threadedportion 1 of theplunger rod 50 according to the present invention canbe brought into threaded engagement and that thesyringe barrel 11 has an inner diameter such that thecylindrical member 3 of theplunger rod 50 can be inserted with contact slidability in thesyringe barrel 11, for example, an inner diameter either equal to or somewhat greater than the outer diameter of thecylindrical member 3 of theplunger rod 50. For example, thesyringe barrel 11 can be made of glass or a resin such as a cyclic polyolefin. Themedicament delivery tip 14 arranged at one end of thesyringe barrel 11 is sealed with thesuitable closure 13, for example, a rubber cap of excellent chemical resistance or a rubber cap covered with a plastic film having excellent chemical resistance. Themedicament 15 prefilled within thesyringe barrel 11 can be, for example a desired medicament such as a contrast medium, and is sealed by thepiston 12 which can be made, for example, of rubber of excellent chemical resistance or rubber covered with a plastic film having excellent chemical resistance. - With reference to
FIG. 3 , a description will now be made about the manner of use of the syringe according to the present invention. First, a forward endportion of theplunger rod 50 according to the present invention is inserted through the read end of thesyringe barrel 11. When the forward end of theplunger rod 50 is inserted through the rear end of thesyringe barrel 11 as mentioned above, theplunger rod 50 is guided by the inner wall of thesyringe barrel 11 because no clearance is formed between the outer wall of thecylindrical member 3 of theplunger rod 50 and the inner wall of thesyringe barrel 11. As a consequence, the central axis of theplunger rod 50 is naturally brought into alignment with the central axis of thesyringe barrel 11. With the central axis of theplunger rod 50 maintained in alignment with the central axis of thesyringe barrel 11 as described above, theplunger rod 50 is pushed straight into thesyringe barrel 11, and further, theplunger rod 50 is turned to bring the threadedportion 1, which is arranged at the forward end of theplunger rod 50, into threaded engagement with the screw bore 16 formed along the central axis of the piston in the rear end portion of thepiston 12. To the free end of theplunger rod 50, thepiston 12 can be attached in a correct attitude (i.e., in the attitude that the central axis of thepiston 12 is in alignment with the central axis of the plunger rod 50). - Also as depicted in
FIG. 3 , therubber closure 13 by which themedicament delivery tip 14 of thesyringe barrel 11 is sealed is then removed, and to themedicament delivery tip 14, a syringe needle or a free end of an extension tube is fitted, for example. By pushing thepiston 12 via theplunger rod 50, themedicament 15 can be injected or otherwise delivered to an intended site, for example, into the body via the syringe needle, the extension tube or the like. As substantially no clearance is formed between the outer wall of theplunger rod 50 and the inner wall of thesyringe barrel 11 during the pushing of thepiston 12, the piston can be prevented from sliding in an attitude misaligned with the central axis with thesyringe barrel 11. It is, therefore, possible to prevent the occurrence of fluid leakage.
Claims (9)
- A plunger rod (50;60;70;80) useful for supporting and sliding a piston (12) inserted in a syringe barrel (11), said plunger rod having a threaded portion (1) formed at an end of said plunger rod to attach saidpiston (12) on said plunger rod and a flange (2) formed at an opposite end of said plunger rod, wherein:said threaded portion (1) and said flange (2) are integrally connected together by a cylindrical member (3) having an outer diameter such that said cylindrical member (3) can be inserted with contact slidability in said syringe barrel (11).
- A plunger rod according to claim 1, further comprising a thumb support member arranged in a hollow opening formed in said flange (2) on said cylindrical member (3).
- A plunger rod according to claim 2, wherein saidthumb support member comprises plural ribs arranged along a direction of a length of said cylindrical member (3) at least inside said cylindrical member (3).
- A plunger rod according to claim 3, wherein said plural ribs (5A) are formed in a cross-sectionally cruciform shape.
- A plunger rod according to claim 3, wherein said plural ribs (5B) are partially cut off along a central axis of said cylindrical member (3).
- A plunger rod according to claim 2, wherein saidthumb support member comprises a plug (8) fitted in said hollow opening formed in said flange (2) on said cylindrical member (3).
- A plunger rod according to claim 1, wherein said threaded portion (1) is a short cylinder, and plural ribs (6) are formed inside said short cylinder.
- A plunger rod according to claim 1, wherein said plunger rod is integrally formed in an entirety thereof with at least one resin selected from the group consisting of cyclic olefin resins, radiation-resistant polypropylenes, polypropylene, polycarbonates and polystyrene.
- A syringe comprising:a syringe barrel set (100) having a syringe barrel (11), which is provided at an end thereof with a medicament delivery tip (14) sealed with a closure (13) and is open at an opposite end thereof, and a piston (12) having a screw bore (16) formed along a central axis of said piston in a rear portion of said piston and slidably sealing said open end of said syringe barrel (11) ; and a plunger rod (50;60;70;80) as defined in any one of claims 1-8.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007299089A JP2009119171A (en) | 2007-11-19 | 2007-11-19 | Plunger rod and syringe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2060290A1 true EP2060290A1 (en) | 2009-05-20 |
EP2060290B1 EP2060290B1 (en) | 2011-02-02 |
Family
ID=40361655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08019559A Not-in-force EP2060290B1 (en) | 2007-11-19 | 2008-11-07 | Plunger rod and syringe |
Country Status (6)
Country | Link |
---|---|
US (1) | US8002754B2 (en) |
EP (1) | EP2060290B1 (en) |
JP (1) | JP2009119171A (en) |
AT (1) | ATE497399T1 (en) |
DE (1) | DE602008004813D1 (en) |
DK (1) | DK2060290T3 (en) |
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JPWO2009011214A1 (en) * | 2007-07-13 | 2010-09-16 | 株式会社大協精工 | Syringe plunger assembly |
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US8721603B2 (en) | 2008-01-15 | 2014-05-13 | West Pharmaceutical Services, Inc. | Syringe with co-molded hub and cannula |
US8496862B2 (en) | 2008-01-15 | 2013-07-30 | West Pharmaceutical Services, Inc. | Collet mechanism and method of molding cannula to a syringe barrel |
RU2523773C2 (en) | 2009-05-13 | 2014-07-20 | СиО2 Медикал Продактс, Инк., | Gas release process for inspection of coated surfaces |
US9458536B2 (en) | 2009-07-02 | 2016-10-04 | Sio2 Medical Products, Inc. | PECVD coating methods for capped syringes, cartridges and other articles |
WO2012003221A1 (en) * | 2010-06-29 | 2012-01-05 | Cv Holdings, Llc | Syringe with integrated needle |
US9878101B2 (en) | 2010-11-12 | 2018-01-30 | Sio2 Medical Products, Inc. | Cyclic olefin polymer vessels and vessel coating methods |
US9272095B2 (en) | 2011-04-01 | 2016-03-01 | Sio2 Medical Products, Inc. | Vessels, contact surfaces, and coating and inspection apparatus and methods |
USD693002S1 (en) | 2011-09-21 | 2013-11-05 | West Pharmaceutical Services, Inc. | Hub for medical container |
US20130116628A1 (en) * | 2011-11-04 | 2013-05-09 | Becton, Dickinson And Company | Recycled Resin Compositions And Disposable Medical Devices Made Therefrom |
US9554968B2 (en) | 2013-03-11 | 2017-01-31 | Sio2 Medical Products, Inc. | Trilayer coated pharmaceutical packaging |
USD689188S1 (en) | 2012-07-19 | 2013-09-03 | West Pharmaceutical Services, Inc. | Syringe plunger rod |
JP6509734B2 (en) | 2012-11-01 | 2019-05-08 | エスアイオーツー・メディカル・プロダクツ・インコーポレイテッド | Film inspection method |
WO2014078666A1 (en) | 2012-11-16 | 2014-05-22 | Sio2 Medical Products, Inc. | Method and apparatus for detecting rapid barrier coating integrity characteristics |
US9764093B2 (en) | 2012-11-30 | 2017-09-19 | Sio2 Medical Products, Inc. | Controlling the uniformity of PECVD deposition |
WO2014085348A2 (en) | 2012-11-30 | 2014-06-05 | Sio2 Medical Products, Inc. | Controlling the uniformity of pecvd deposition on medical syringes, cartridges, and the like |
EP2961858B1 (en) | 2013-03-01 | 2022-09-07 | Si02 Medical Products, Inc. | Coated syringe. |
US9937099B2 (en) | 2013-03-11 | 2018-04-10 | Sio2 Medical Products, Inc. | Trilayer coated pharmaceutical packaging with low oxygen transmission rate |
US20160017490A1 (en) | 2013-03-15 | 2016-01-21 | Sio2 Medical Products, Inc. | Coating method |
WO2016090220A1 (en) | 2014-12-04 | 2016-06-09 | Tolmar Therapeutics, Inc. | Syringe plunger system with self-locking threaded geometry |
US10576207B2 (en) | 2015-10-09 | 2020-03-03 | West Pharma. Services IL, Ltd. | Angled syringe patch injector |
JP7044708B2 (en) | 2015-10-09 | 2022-03-30 | ウェスト ファーマ サービシーズ イスラエル リミテッド | How to fill a customized syringe |
JP6885960B2 (en) | 2016-01-21 | 2021-06-16 | ウェスト ファーマ サービシーズ イスラエル リミテッド | Drug delivery device with visual indicators |
JP6513297B2 (en) | 2016-01-21 | 2019-05-22 | ウェスト ファーマ サービシーズ イスラエル リミテッド | Automatic injector, receiving frame and method of connecting cartridge in automatic injector |
EP3405229A1 (en) | 2016-01-21 | 2018-11-28 | West Pharma. Services Il, Ltd. | Needle insertion and retraction mechanism |
US10774301B2 (en) * | 2016-07-11 | 2020-09-15 | Board Of Trustees Of Southern Illinois University | Syringe system for fluid separation |
US11338090B2 (en) | 2016-08-01 | 2022-05-24 | West Pharma. Services IL, Ltd. | Anti-rotation cartridge pin |
US11819666B2 (en) | 2017-05-30 | 2023-11-21 | West Pharma. Services IL, Ltd. | Modular drive train for wearable injector |
US10478561B2 (en) | 2017-08-03 | 2019-11-19 | Minhong Yu | Wireless transmission system with integrated sensing capability |
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- 2007-11-19 JP JP2007299089A patent/JP2009119171A/en active Pending
-
2008
- 2008-11-05 US US12/265,271 patent/US8002754B2/en not_active Expired - Fee Related
- 2008-11-07 AT AT08019559T patent/ATE497399T1/en active
- 2008-11-07 EP EP08019559A patent/EP2060290B1/en not_active Not-in-force
- 2008-11-07 DE DE602008004813T patent/DE602008004813D1/en active Active
- 2008-11-07 DK DK08019559.7T patent/DK2060290T3/en active
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Also Published As
Publication number | Publication date |
---|---|
EP2060290B1 (en) | 2011-02-02 |
ATE497399T1 (en) | 2011-02-15 |
DE602008004813D1 (en) | 2011-03-17 |
US8002754B2 (en) | 2011-08-23 |
DK2060290T3 (en) | 2011-03-07 |
JP2009119171A (en) | 2009-06-04 |
US20090131878A1 (en) | 2009-05-21 |
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